// #########################################################################
#include "..//..//stdafx.h"
#include "md5int.h"

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#define S11 7
#define S12 12
#define S13 17
#define S14 22
#define S21 5
#define S22 9
#define S23 14
#define S24 20
#define S31 4
#define S32 11
#define S33 16
#define S34 23
#define S41 6
#define S42 10
#define S43 15
#define S44 21

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#define F(x,y,z) (((x)&(y))|((~x)&(z)))
#define G(x,y,z) (((x)&(z))|((y)&(~z)))
#define H(x,y,z) ((x)^(y)^(z))
#define I(x,y,z) ((y)^((x)|(~z)))

// #########################################################################

#define _lrotl(x,n) ((((unsigned long)(x)) << ((int) ((n) & 31))) | (((unsigned long)(x)) >> ((int) ((-(n)) & 31))))
#define ROTATE_LEFT(x,n) _lrotl(x,n)

// #########################################################################

#define FF(a,b,c,d,x,s,ac) {\
    (a)+=F((b),(c),(d))+(x)+(DWORD)(ac);\
    (a)=ROTATE_LEFT((a),(s));\
    (a)+=(b);}
#define GG(a,b,c,d,x,s,ac) {\
    (a)+=G((b),(c),(d))+(x)+(DWORD)(ac);\
    (a)=ROTATE_LEFT((a),(s));\
    (a)+=(b);}
#define HH(a,b,c,d,x,s,ac) {\
    (a)+=H((b),(c),(d))+(x)+(DWORD)(ac);\
    (a)=ROTATE_LEFT((a),(s));\
    (a)+=(b);}
#define II(a,b,c,d,x,s,ac) {\
    (a)+=I((b),(c),(d))+(x)+(DWORD)(ac);\
    (a)=ROTATE_LEFT((a),(s));\
    (a)+=(b);}

// #########################################################################

void MD5Init(MD5_CTX*context)
{
    context->count[0]=context->count[1]=0;
    context->state[0]=0x67452301;
    context->state[1]=0xefcdab89;
    context->state[2]=0x98badcfe;
    context->state[3]=0x10325476;
}

// #########################################################################

/* MD5 finalization. Ends an MD5 message-digest operation, writing the
  the message digest and zeroizing the context. */
void MD5Final (void*_digest_, MD5_CTX *context)
{ /* message digest */ /* context */
  BYTE*digest=(BYTE*)_digest_;

  BYTE bits[8];
  BYTE PADDING[64];
  DWORD index, padLen;

  /* Save number of bits */
  memcpy (bits, context->count, 8);

  /* Pad out to 56 mod 64. */
  index = (DWORD)((context->count[0] >> 3) & 0x3f);
  padLen = (index < 56) ? (56 - index) : (120 - index);
  memset(PADDING,0,64);
  PADDING[0]=0x80;
  MD5Update (context, PADDING, padLen);

  /* Append length (before padding) */
  MD5Update (context, bits, 8);

  /* Store state in digest */
  memcpy (digest, context->state, 16);

  /* Zeroize sensitive information. */
  memset ((BYTE*)context, 0, sizeof (*context));
}

// #########################################################################

static void MD5Transform(DWORD state[4],BYTE block[64])
{
    DWORD a=state[0],b=state[1],c=state[2],d=state[3],x[16];
    memcpy(x,block,64);
    /* Round 1 */
    FF (a, b, c, d, x[ 0], S11, 0xd76aa478); /* 1 */
    FF (d, a, b, c, x[ 1], S12, 0xe8c7b756); /* 2 */
    FF (c, d, a, b, x[ 2], S13, 0x242070db); /* 3 */
    FF (b, c, d, a, x[ 3], S14, 0xc1bdceee); /* 4 */
    FF (a, b, c, d, x[ 4], S11, 0xf57c0faf); /* 5 */
    FF (d, a, b, c, x[ 5], S12, 0x4787c62a); /* 6 */
    FF (c, d, a, b, x[ 6], S13, 0xa8304613); /* 7 */
    FF (b, c, d, a, x[ 7], S14, 0xfd469501); /* 8 */
    FF (a, b, c, d, x[ 8], S11, 0x698098d8); /* 9 */
    FF (d, a, b, c, x[ 9], S12, 0x8b44f7af); /* 10 */
    FF (c, d, a, b, x[10], S13, 0xffff5bb1); /* 11 */
    FF (b, c, d, a, x[11], S14, 0x895cd7be); /* 12 */
    FF (a, b, c, d, x[12], S11, 0x6b901122); /* 13 */
    FF (d, a, b, c, x[13], S12, 0xfd987193); /* 14 */
    FF (c, d, a, b, x[14], S13, 0xa679438e); /* 15 */
    FF (b, c, d, a, x[15], S14, 0x49b40821); /* 16 */
    /* Round 2 */
    GG (a, b, c, d, x[ 1], S21, 0xf61e2562); /* 17 */
    GG (d, a, b, c, x[ 6], S22, 0xc040b340); /* 18 */
    GG (c, d, a, b, x[11], S23, 0x265e5a51); /* 19 */
    GG (b, c, d, a, x[ 0], S24, 0xe9b6c7aa); /* 20 */
    GG (a, b, c, d, x[ 5], S21, 0xd62f105d); /* 21 */
    GG (d, a, b, c, x[10], S22,  0x2441453); /* 22 */
    GG (c, d, a, b, x[15], S23, 0xd8a1e681); /* 23 */
    GG (b, c, d, a, x[ 4], S24, 0xe7d3fbc8); /* 24 */
    GG (a, b, c, d, x[ 9], S21, 0x21e1cde6); /* 25 */
    GG (d, a, b, c, x[14], S22, 0xc33707d6); /* 26 */
    GG (c, d, a, b, x[ 3], S23, 0xf4d50d87); /* 27 */
    GG (b, c, d, a, x[ 8], S24, 0x455a14ed); /* 28 */
    GG (a, b, c, d, x[13], S21, 0xa9e3e905); /* 29 */
    GG (d, a, b, c, x[ 2], S22, 0xfcefa3f8); /* 30 */
    GG (c, d, a, b, x[ 7], S23, 0x676f02d9); /* 31 */
    GG (b, c, d, a, x[12], S24, 0x8d2a4c8a); /* 32 */
    /* Round 3 */
    HH (a, b, c, d, x[ 5], S31, 0xfffa3942); /* 33 */
    HH (d, a, b, c, x[ 8], S32, 0x8771f681); /* 34 */
    HH (c, d, a, b, x[11], S33, 0x6d9d6122); /* 35 */
    HH (b, c, d, a, x[14], S34, 0xfde5380c); /* 36 */
    HH (a, b, c, d, x[ 1], S31, 0xa4beea44); /* 37 */
    HH (d, a, b, c, x[ 4], S32, 0x4bdecfa9); /* 38 */
    HH (c, d, a, b, x[ 7], S33, 0xf6bb4b60); /* 39 */
    HH (b, c, d, a, x[10], S34, 0xbebfbc70); /* 40 */
    HH (a, b, c, d, x[13], S31, 0x289b7ec6); /* 41 */
    HH (d, a, b, c, x[ 0], S32, 0xeaa127fa); /* 42 */
    HH (c, d, a, b, x[ 3], S33, 0xd4ef3085); /* 43 */
    HH (b, c, d, a, x[ 6], S34,  0x4881d05); /* 44 */
    HH (a, b, c, d, x[ 9], S31, 0xd9d4d039); /* 45 */
    HH (d, a, b, c, x[12], S32, 0xe6db99e5); /* 46 */
    HH (c, d, a, b, x[15], S33, 0x1fa27cf8); /* 47 */
    HH (b, c, d, a, x[ 2], S34, 0xc4ac5665); /* 48 */
    /* Round 4 */
    II (a, b, c, d, x[ 0], S41, 0xf4292244); /* 49 */
    II (d, a, b, c, x[ 7], S42, 0x432aff97); /* 50 */
    II (c, d, a, b, x[14], S43, 0xab9423a7); /* 51 */
    II (b, c, d, a, x[ 5], S44, 0xfc93a039); /* 52 */
    II (a, b, c, d, x[12], S41, 0x655b59c3); /* 53 */
    II (d, a, b, c, x[ 3], S42, 0x8f0ccc92); /* 54 */
    II (c, d, a, b, x[10], S43, 0xffeff47d); /* 55 */
    II (b, c, d, a, x[ 1], S44, 0x85845dd1); /* 56 */
    II (a, b, c, d, x[ 8], S41, 0x6fa87e4f); /* 57 */
    II (d, a, b, c, x[15], S42, 0xfe2ce6e0); /* 58 */
    II (c, d, a, b, x[ 6], S43, 0xa3014314); /* 59 */
    II (b, c, d, a, x[13], S44, 0x4e0811a1); /* 60 */
    II (a, b, c, d, x[ 4], S41, 0xf7537e82); /* 61 */
    II (d, a, b, c, x[11], S42, 0xbd3af235); /* 62 */
    II (c, d, a, b, x[ 2], S43, 0x2ad7d2bb); /* 63 */
    II (b, c, d, a, x[ 9], S44, 0xeb86d391); /* 64 */
    state[0]+=a;
    state[1]+=b;
    state[2]+=c;
    state[3]+=d;
}

// #########################################################################

/* MD5 block update operation. Continues an MD5 message-digest
  operation, processing another message block, and updating the
  context. */
void MD5Update (MD5_CTX *context,const void*_input_,const DWORD inputLen)
{ /* context */  /* input block */ /* length of input block */
  BYTE*input=(BYTE*)_input_;

  DWORD i, index, partLen;

  /* Compute number of bytes mod 64 */
  index = (DWORD)((context->count[0] >> 3) & 0x3F);

  /* Update number of bits */
  if ((context->count[0] += ((DWORD)inputLen << 3)) < ((DWORD)inputLen << 3))
   context->count[1]++;

  context->count[1] += ((DWORD)inputLen >> 29);
  partLen = 64 - index;

  /* Transform as many times as possible.*/
  if (inputLen >= partLen)
  {
    memcpy((BYTE*)&context->buffer[index], (BYTE*)input, partLen);
    MD5Transform (context->state, context->buffer);

    for (i = partLen; i + 63 < inputLen; i += 64)
     MD5Transform (context->state, &input[i]);
    index = 0;
  }
  else
   i = 0;

  /* Buffer remaining input */
  memcpy((BYTE*)&context->buffer[index], (BYTE*)&input[i],inputLen-i);
}

// #########################################################################
